![]() ![]() PA-K2 only because higher-level codes had been destroyed December 2 on orders from Tokyo. It printed new editions of codes and ciphers and distributed them, and contracted with manufacturers for cipher machines.Ĭhinese ideographic code list, and codes bearing kata kana names, such as ta, ji, or hen, it relied in the main on four systems. More and more codes were broken, and as the international situation stimulated an increasing flow of intercepts, the magic intelligence approached flood stage. My goal has been twofold: to narrate the development of the various methods of making and breaking codes and ciphers, and to tell how these methods have affected men.Īn odd characteristic is that nomenclators were always written on large folded sheets of paper, whereas modern codes are almost invariably in book or booklet form.
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